1 Department of Otorhinolaryngology/Head and Neck Surgery, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka, 431-3192, Japan. seijih@hama-med.ac.jp.
2 Department of Otorhinolaryngology/Head and Neck Surgery, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka, 431-3192, Japan.
3 Yamahoshi ENT Clinic, Hamamatsu, Japan.
4 Department of Otorhinolaryngology, Seirei Hamamatsu General Hospital, Hamamatsu, Japan.